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Journal of Applied Geology
Published by Universitas Gadjah Mada
ISSN : 25022822     EISSN : 25022822     DOI : https://doi.org/10.22146
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science
Journal of Applied Geology – JAG focuses on the applied geology and geosciences with its key objective particularly emphasis on application of basic geological knowledge for addressing environmental, engineering, and geo-hazards problems. The subject covers variety of topics including geodynamics, sedimentology and stratigraphy, volcanology, engineering geology, environmental geology, hydrogeology, geo-hazard and mitigation, mineral resources, energy resources, medical geology, geo-archaeology, as well as applied geophysics and geodesy.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 5 Documents
 1 
Search results for , issue "Vol 9, No 2 (2024)" : 5 Documents clear
Significance Of Differences From Sumatera, Kalimantan, and Sulawesi Coal Based On Cluster Analysis And Statistics Rachman, Rizki Satria; Hidayat, Rahmat; Rahmat, Soleh Basuki; Wibisono, Sigit Arso
Journal of Applied Geology Vol 9, No 2 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.95095

Abstract

Indonesia has a complex geological structure with coal potential dominated by 3 main islands, Sumatra (SMS), Kalimantan (KS), and Sulawesi (SLS). However, the characteristics of coal on these three islands are not explained further. Therefore, this research is intended to see the significant differences in coal on Sumatra, Kalimantan and Sulawesi in terms of their characteristics. The research methods carried out include literature study, field activities, laboratory analysis including proximate analysis (total moisture, moisture, volatile matter, fixed carbon), total sulfur, calories, specific gravity, HGI, ultimate analysis (C, H, N, O, S), and coal ash analysis, as well as data processing using cluster analysis and principle component analysis (PCA). Result, 55 coal samples were obtained on these three islands which were divided into 9 main clusters with 50% similarity. Kalimantan Island has coal with an increase in TiO2, Al2O3, Na2O oxides with carbon and nitrogen elements. Sumatra Island has coal with increased TM, M, MnO, CaO, MgO, Fe2O3, and SO3 and a slight influence of HGI, TS. Meanwhile, Sulawesi Island has coal with complex parameters and an increase in calorific value. It is interpreted that the differences in coal characteristics are influenced by the different geological settings of these three islands in the past until resen.
Mineralogical and Geochemical Characteristics of Clays at Godean Hills, Yogyakarta – Indonesia (A Study Case at Gunung Patuk and Gunung Wungkal) Yoellanice, Diory; Titisari, Anastasia Dewi; Setiawan, Nugroho Imam
Journal of Applied Geology Vol 9, No 2 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.95164

Abstract

Gunung Patuk and Gunung Wungkal are part of the Godean Hills in Yogyakarta, Indonesia. The Godean Hills are isolated hills consisting of a series of hills surrounded by the Young Merapi Volcanics Deposits. A previous study reported that Gunung Patuk and Gunung Wungkal are porphyry andesite – micro diorite intrusions. Both hills are igneous rock intrusion and are found almost perfect soil profiles from the source/parent rock to the A horizon. However, another previous study suggests that at Gunung Wungkal has occurred hydrothermal alteration process. There is still a debate over the genesis of clay in that area, therefore this research needs to be carried out to provide a comprehensive understanding of mineralogical and geochemical characteristics of the clays at that area. The results of petrographic identification on the source/parent rock sample indicate that the rock sample is classified as andesite rock. Meanwhile, the results of mineralogy identification using the X-Ray Diffraction (XRD) method show that almost all types of soil profiles contain illite, kaolinite, and smectite. The calculation results of CIW (Chemical Index Weathering) and CIA (Chemical Index Alteration) values based on geochemical data show that CIW and CIA values increase steadily as they approach the ground surface. Based on the presence of illite (indicates a product relating to the relatively high temperatures) in horizon A with high values of CIW and CIA, therefore it can be interpreted that clay minerals at Gunung Patuk and Gunung Wungkal were the product of superimpose of hydrothermal alteration and weathering processes.
Engineering Geological Characteristics of Construction Area of Section 5 Yogyakarta-Bawen Toll Road, Magelang, Indonesia Abrar, Mifthahul; Tamado, Daniel; Indrawan, I Gde Budi
Journal of Applied Geology Vol 9, No 2 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.95271

Abstract

This paper presents the results of engineering geological mapping conducted in Losari (Central Java), where the Section 5 of the Yogyakarta-Bawen toll road and tunnel will be constructed. This research aimed to evaluate the characteristics of the geomorphology, lithology, and geological structure for assessment of potential geological hazards during and after the toll road and tunnel constructions. This research was conducted by collecting geomorphological and geological data by surface mapping and surface rock engineering properties by laboratory testing, which were not done in the previous site investigation. The surface mapping results show that the study area is at the geomorphological units of steep and gentle slope volcanic hills. The study area consists dominantly of tuff and tuff breccia units. At the surface, the rocks are extremely weathered. The geological structures controlling the study area are extension joints with northwest-southeast and northeast-southwest orientation, consistent with the morphological alignment. Although the study area consists dominantly of hilly morphology and extremely weathered rocks, landslides are rarely observed. This may be attributed to the land use and relatively high friction angle of the soils resulted from weathering of pyroclastic rocks comprising this area. The soils may, however, be susceptible to remoulding. Therefore, cut slopes made for road and tunnel constructions are suggested to be designed to prevent change in the soil state.
Seawater Intrusion Assessment based on Geological, Hydrogeological, Cl/Br vs Cl Graphical Analysis, Recharge Area, and Groundwater Usage in Makassar Coastal Area, South Sulawesi, Indonesia Nugroho, Sunu Ardhi; Wilopo, Wahyu; Lathif, Iqbal Fuady Ahmad; Taufiq, Ahmad
Journal of Applied Geology Vol 9, No 2 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.101429

Abstract

Seawater intrusion is a major concern in coastal urban areas like Makassar, where groundwater is a crucial water source. This study assesses seawater intrusion using multiple approaches, including geological and hydrogeological analysis, Cl/Br vs. Cl graphical analysis, recharge area land use, groundwater usage, and previous seawater intrusion vulnerability mapping. From 20 groundwater samples, five were categorized as brackish and then analyzed using these six perspectives. Geologically, two shallow wells in Mariso and Manggala contain brackish water due to trapped marine sediments, supported hydrogeologically by local groundwater flow patterns indicating past shallow seawater traps, while wells in Tallo show no such indications. Cl/Br vs. Cl graphical analysis classifies the shallow well in Tallo as Seawater, one in Manggala as Brine Basin, and three others as landfill leachate, suggesting anthropogenic contamination. Most groundwater recharge areas are residential and built-up, limiting infiltration and contributing to seawater intrusion. Groundwater usage is highest in Tallo, moderately high in Mariso and Manggala, and moderate in Ujung Pandang. Vulnerability mapping places the Tallo well in a high-risk zone, the Mariso well in a low-risk zone, and the Manggala well in a non-vulnerable area. Across these perspectives, only one sample in the Tallo District is confirmed to experience seawater intrusion.
Evaluation of Reservoir Characteristics of Wells X, Y, Z in the Pliocene Interval of the Tarakan Sub-Basin, Tarakan Basin, North Kalimantan Hendardi, Rizaldi Primanda; Hidajat, Wahju Krisna; Setyawan, Reddy; Kurniasih, Anis; Qadaryati, Nurakhmi; Khorniawan, Wahyu Budhi; Dalimunte, Hasnan Luthfi; Ringga, Anita Galih
Journal of Applied Geology Vol 9, No 2 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.86053

Abstract

The Tarakan Basin is one of the basins that has been producing hydrocarbons since 1901, with nine active oil fields to this day. The exploration of oil and gas in the Tarakan Basin has been ongoing for a considerable amount of time and can be considered as the oldest exploration in Indonesia that continues due to its estimated economically viable reserves based on its geological conditions. Research on the evaluation of reservoir characteristics in the Tarakan Sub-Basin with a Pliocene age interval aims to determine the subsurface lithology and fluid conditions qualitatively and the quantitative characteristics of the reservoir rocks. This study utilizes quantitative petrophysical analysis using a deterministic method with primary data consisting of wireline log data, as well as secondary data including core data, mud logs, biostratigraphy data, drill stem test data, and sidewall core data. Based on the analysis results, the petrophysical properties of the target reservoir in the study area include an average shale volume (VSH) of 16.65% - 29.31%, average effective porosity (PHIE) of 11.80% - 27.09%, which falls into the categories of fair to excellent quality, hydrocarbon saturation ranging from 7.68% - 43.03%, an average permeability value (PERM) of 10.03 mD - 613.29 mD, falling into the categories of good to very good, and a net pay thickness ranging from 4 feet to 16.7 feet, with a total thickness of 67.4 feet containing oil and gas fluids.

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